In the latest PTR patch notes for build 16033, we noted that "certain areas in Act I and Act II have received further adjustments to Monster Density." We've seen some players ask what zones this change applies to, so here's a bit more information.

Zones that are bolded received a straight-up buff to their density.
Zones that are italicized were slightly nerfed.
All other zones had monster spawns adjusted to make them feel more "clumpy."

Act I:

The Lyceum
Cave of the Moon Clan Level 1
Weeping Hollow
Cathedral Level 1
Cathedral Level 2
Leoric’s Hunting Grounds
Whimsyshire


Act II:

Realm of Shadow
Dahlgur Oasis
Vile Cavern
The Storm Halls
The Unknown Depths
The Eastern Channel
The Western Channel


Thank you to everyone who's posted about the density changes so far; your feedback is incredibly appreciated. We're still fine tuning monster density across all Acts, so please be sure to keep sharing your thoughts and experiences from the PTR.